Concerning a 1980 Silverado (Long Bed), would it be possible to add a fuel tank ? It's set up now as a 16 gallon on the passenger side. I do know the same tank will work on either side, of course the sender is different. Would both tanks fill ok using the existing filler neck ? I would have have to use a "T" and use fuel rated hose to reach the other tank. I would like to increase the capacity, but don't want to go through the trouble of adding another fill in the side of the bed.